John Machin (bapt. c. 1686 – June 9, 1751) [1] was a professor of astronomy at Gresham College, London. He is best known for developing a quickly converging series for pi in 1706 and using it to compute pi to 100 decimal places.

约翰·梅钦（英语： John Machin，1686年洗礼－1751年6月9日） [1] 是伦敦格雷沙姆学院的 天文学 教授。他最出名的是在 1706年为 圆周率 开发了一个快速的 收敛级数，并用它来计算到100位小数。

马青公式由英国天文学教授约翰·马青(John Machin ，1686 –1751)于1706年发现，他利用这个公式计算到了100位的圆周率。

Machin-like formulas for π can be constructed by finding a set of integers , where all the prime factorisations of ⁠ ⁠, taken together, use a number of distinct primes , and then using either linear algebra or the LLL basis-reduction algorithm to construct linear combinations of arctangents of .

John Machin (born 1680—died 1751) was an English mathematician, notable for studies in finding the area of a circle. In 1706, he was the first to compute the value of the constant π to 100 decimal places. Machin’s formula for π was adapted by others, including Euler, to extend his result. Machin was a professor of astronomy at Gresham …

约翰·梅钦（英语： John Machin，1686年洗礼－1751年6月9日） [1] 是伦敦格雷沙姆学院的 天文学 教授。他最出名的是在 1706年为 圆周率 开发了一个快速的 收敛级数，并用它来计算到100位小数。

John Machin was an English mathematician and astronomer best known for the formulas he invented for calculating π.

Remember ! Slice of life John Machin is a not-so-well-known mathematician. He was born in 1680 was a profesor in astonomy in London. He discover in 1706 the formula =16arctan (1/5)-4arctan (1/239), which, thanks to the development of the power serie of arctan known since Grégory, allowed him to get the above formula... But for the experience historian of Pi, Machin played an important role ...

John Machin, (bapt. 1686?—June 9, 1751), [1] a professor of astronomy at Gresham College, London, is best known for developing a quickly converging series for Pi in 1706 and using it to compute Pi to 100 decimal places.

John Machin, (1680 — 1752), a professor of astronomy in London, is best known for developing a quickly converging inverse-tangent series for π (Pi) in 1706 and using it to compute π to 100 decimal places.